969 
FXUS66 KSGX 072129
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
200 PM PST SAT NOV 7 2009

.SYNOPSIS...HIGH PRESSURE WILL SLOWLY BUILD THROUGH TUESDAY AND IT 
WILL BECOME A LITTLE WARMER. THE MARINE LAYER WILL CONTINUE TO BRING 
LOW CLOUDS AND FOG NEAR THE COAST...BUT BECOME LESS EXTENSIVE. ON 
WEDNESDAY THROUGH FRIDAY A LOW PRESSURE TROUGH WILL MOVE THROUGH THE 
REGION AND BRING MORE CLOUDS AND COOLER WEATHER. 

&&

.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO... 
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.

LOW CLOUDS NEAR THE COAST ARE STUBBORN IN SOME AREAS...BUT OTHER 
THAN THAT SKIES WERE MOSTLY SUNNY WITH SOME HIGH CLOUDS DRIFTING 
ACROSS THE SKY THIS AFTERNOON. A FLAT ZONAL FLOW ACROSS CALIFORNIA 
TODAY WILL SLOWLY LIFT INTO A WEAK HIGH PRESSURE RIDGE THROUGH 
TUESDAY AND THAT WILL BRING SLIGHTLY WARMER WEATHER TO ALL AREAS. 
RANDOM MOISTURE ALOFT WILL CONTINUE TO BRING PERIODS OF HIGH CLOUDS. 
THE HIGHER PRESSURE ALOFT AND VERY WEAK OFFSHORE FLOW WILL CAUSE THE 
MARINE LAYER TO GO MORE SHALLOW AND SO THE LOW CLOUDS WILL MAKE IT 
NOT SO FAR INLAND INCREMENTALLY EACH OF THE NEXT FEW NIGHTS. THE 
OFFSHORE FLOW BY MONDAY MORNING IS ENOUGH TO PRODUCE WINDS THAT GUST 
TO 25 MPH THROUGH MOUNTAIN PASSES. MONDAY AND TUESDAY WILL BE OUR 
WARMEST DAYS FOR A WHILE AS THE WEAK RIDGE PATTERN PEAKS. AN UPPER 
LEVEL TROUGH WILL PASS THROUGH CALIFORNIA WEDNESDAY THROUGH FRIDAY. 
IT LOSES MOISTURE AS IT MOVES THROUGH SOUTHERN CALIFORNIA AND SO IT 
LOOKS LIKE WE WILL GET NO RAIN. STRENGTHENED ONSHORE FLOW WILL MAKE 
THINGS BREEZY IN THE MOUNTAINS AND DESERTS. WE CAN EXPECT COOLER 
WEATHER AND MORE CLOUDS...BUT NOT OVERLY CLOUDY AS THE THE MARINE 
LAYER WILL BE DISRUPTED AND THE SPARSE MOISTURE WILL REMAIN ALOFT. 
BEHIND THAT TROUGH A STRONGER RIDGE ALONG WITH OFFSHORE FLOW APPEAR 
FOR NEXT WEEKEND.

&&

.AVIATION...
072000Z...MARINE LAYER DEPTH REMAINS AROUND 1500 FEET AND SHOULD 
LOWER TO AROUND 1200 FEET TONIGHT AND SUNDAY MORNING. AREAS OF 
STRATUS ALONG THE COAST THROUGH SPREAD INLAND OVERNIGHT. COASTAL 
AIRPORTS SHOULD GET CEILINGS BETWEEN 02Z AND 07Z. EARLIER BREAK UP 
IS EXPECTED ON SUNDAY...BY 17Z.

ABOVE THE MARINE LAYER...EXCEPT FOR SOME CIRRUS AT OR ABOVE 
FL250...A MOSTLY CLEAR SKY WITH UNRESTRICTED VISIBILITIES WILL 
CONTINUE THROUGH SUNDAY.  HORTON

&&

.SGX WATCHES/WARNINGS/ADVISORIES...NONE. 

&&

$$

PUBLIC...MM
AVIATION...HORTON